[Error: Irreparable invalid markup ('<iframe [...] allowfullscreen<iframe>') in entry. Owner must fix manually. Raw contents below.]

<iframe width="420" height="315" src="https://www.youtube.com/embed/qCLhv19CS1M" frameborder="0" allowfullscreen<iframe="allowfullscreen&lt;iframe" width="420" height="315" src="https://www.youtube.com/embed/qCLhv19CS1M" frameborder="0" allowfullscreen="allowfullscreen"></iframe>